diff options
Diffstat (limited to 'fs/btrfs/block-group.c')
| -rw-r--r-- | fs/btrfs/block-group.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c index 9bf282d2453c..fcd274d83fd7 100644 --- a/fs/btrfs/block-group.c +++ b/fs/btrfs/block-group.c @@ -1795,7 +1795,14 @@ static int reclaim_bgs_cmp(void *unused, const struct list_head *a, bg1 = list_entry(a, struct btrfs_block_group, bg_list); bg2 = list_entry(b, struct btrfs_block_group, bg_list); - return bg1->used > bg2->used; + /* + * Some other task may be updating the ->used field concurrently, but it + * is not serious if we get a stale value or load/store tearing issues, + * as sorting the list of block groups to reclaim is not critical and an + * occasional imperfect order is ok. So silence KCSAN and avoid the + * overhead of locking or any other synchronization. + */ + return data_race(bg1->used > bg2->used); } static inline bool btrfs_should_reclaim(const struct btrfs_fs_info *fs_info) @@ -2031,7 +2038,7 @@ void btrfs_reclaim_bgs(struct btrfs_fs_info *fs_info) btrfs_reclaim_sweep(fs_info); spin_lock(&fs_info->unused_bgs_lock); if (!list_empty(&fs_info->reclaim_bgs)) - queue_work(system_unbound_wq, &fs_info->reclaim_bgs_work); + queue_work(system_dfl_wq, &fs_info->reclaim_bgs_work); spin_unlock(&fs_info->unused_bgs_lock); } |